Pump



July 18, 1939. H. L. BANCROFT PUMP Filed May 9, 1938 W 4 @nu a 33 mvENToR.

/lowmw L nnceofr fha man d ATTORNEYr Patented July 18, 1939 UNITED STATES PATENT OFFICE PUMP Howard L. Bancroft,

Sharon, Pa., assignor of 8 Claims.

This invention relates to improvements in pumps, and has reference particularly to novel valving means for pumps of the class in which the plunger has a compound motion of reciprocation and oscillation.

One of the objects of the invention is the provision of simple and effective means for actuating the valves of a pump of the character stated.

Other objects and features of novelty will api., pear as I proceed with the description of those embodiments of the invention which, for the purposes of the present application, I have illustrated in the accompanying drawing, in which Fig. 1 is a longitudinal central sectional view l5 of a pump embodying the invention.

Figs. 2, 3 and 4 are cross sectional views taken substantially on the line 2--2, 3-3 and 4-4 of Fig. 1.

Fig. 5 is a diagram illustrating the path of 20 movement of a point on the plunger of the pump.

Fig. 6 is a vieW similar to Fig. 1 illustrating another embodiment of the invention.

Fig. '7 is a fragmental View on a larger scale showing the valve mounting at one end of the plunger in the Fig. 6 modification.

Referring now to Figs. 1 to 4 inclusive, the casingof the pump is shown at I0. It is cylindrical in form for the most part, but midway between its ends it is provided with a lateral extension I,

5U which is also cylindrical in form about an axis at right angles to the axis of cylinder Il). The bore of cylinder I receives a hollow plunger I2 which is adapted to have a compound motion of reciprocation and oscillation in the cylinder. This 35 motion may be imparted to the plunger conveniently by mechanism of the character illustrated herein, consisting of a ball I3 formed in-l tegral with a post I4 which is set radially into the cylindrical plunger I2 and secured therein by U a pin I5. The ball is received in a cylindrical socket IB formed eccentrically upon a circular plate I'I which rotates Within the extension II, the plate. being carried concentrically upon a shaft I8 journaled in a bracket I9 which is 4:', mounted at the outer end of extension II by means of screws or the like. Shaft I8 may be driven from any suitable power source, preferably an electric motor, not shown.

' At the intake end of the pump, cylinder I0 is 50 closed partially b-y a circular plate 2| that is fastenedl to the cylinder by screws 22 or the like. In this plate there are a series of segment shaped openings 23 evenly spaced around the center of the plate.

The plunger I2 has reduced end portions 24 (Cl. 10S-157) and 25, and suitable ring packings 26 and 21 are mounted on the plunger at the junction of these reduced end portions with the central portion of greater thickness. 2B is a sleeve which lits over the reduced portion 24 and serves to clamp the packing 26 in place. This sleeve is secured to the plunger by suitable means, as by a series of screws 29 which serve to hold the sleeve against both rotative and longitudinal movements. In the outer surface of this sleeve there are formed a series of longitudinal grooves 3Il, which are adapted to slidably receive pins 3| that are carried by a cylindrical skirt 32 formed preferably integral with a valve plate 33, the latter having a series of segment shaped ports therein adapted to register with the openings 23 in the plate 2|. Cylinder I0 is counterbored to receive skirt 32 flush With the inner surface of the rest of the cylinder, and its length is such that the valve plate 33 is held in engagement with plate 2|. Skirt 32 can turn in the cylinder, and it does turn along with valve plate 33 during the operation of the pump, being driven by the pin and groove connection with plunger I2.

At the delivery end of the pump the reduced .2

portion of the plunger is surrounded by a sleeve 35, the purpose of which is to clamp packing ring 21 in place. This end of the plunger is partially closed by a plate 36 provided with a series of segment shaped openings 31. sleeve are both fastened to the plunger by screws 38.

A valve plate 39 is carried by the plunger in engagement With plate 36, these two plates being connected together at the center only by means of a headed pivot 40. Valve plate 39 has formed therein segment shaped valve ports 4| which are adapted to register with the openings 3l in plate 36. Suitable means are provided for preventing rotation of plate 39 as it reciprocates with the plunger. As herein illustrated this means consists of tongues 42 on the plate running in longitudinal grooves 43 cut into the inner surface of the cylinder.

In the operation of the pump the socket I6 revolves in a circle. The axis of the plunger has a straight line movement. The movement of any point of the plunger between its axis and the ball I3 is elliptical, the proportions of the ellipse varying between a straight line and a circle. The ellipse described by the movement of a pin 3| is substantially like that illustrated in Fig. 5. Hence the movements of valve plate 33 are controlled in accordance with the Fig. 5 ellipse. This produces a rapid turning movement of the valve plate This plate Aand the at each end of the plunger movement, which is of course important because the opening and closing movements of the valve should occupy a relatively small part of the cycle. The valve plates S3 and 39 are oppositely set, that is valve 33 is open while valve 39 is closed and vice versa.

As shown in Fig. l, the suction stroke of the pump is about to begin. As the ball I3 travels through the next of its movement a charge of iluid is drawn into the plunger, which is closed at its right hand end. At the end of this stroke both Valves change, the charge is trapped in the pump by the closed valve 33, and part of it is forced out of the plunger through the open valve 39. Since the length of the plunger is greater than 'the length of its stroke the plunger will of course not be completely emptied on the return stroke.

The modication of Figs. 6 and 7 is very similar in construction to the first described form of the invention. The principal distinction resides in the fact that an additional valve is provided for the plunger and located at the left or intake end thereof. The left end of the plunger is partially closed by a plate 45 provided with segmental openings, this plate being secured to the plunger by screws 29. A valve plate 46 with segmental ports adapted to register with the openings in plate l5 is mounted within the plunger to have a bearing on the inner wall thereof. This valve plate dit is held in engagement with plate 45 by an axial rod 4'! which extends throughout the length of the plunger and has a reduced part i8 of circular cross section which extends through a circular central opening in plate 3&5', similar to plate 36 of the iirst described form of the invention. A valve plate 39', similar to plate 39, has a central square opening which receives a squared part A@ of the rod 4l, the plate 39 being held in contact with the plate 36 by a nut E@ threaded onto the threaded extremity of rod ill. Plate 39' has a tongue and groove connection with the cylinder, the same as in the case of plate 39. Accordingly plate 39 is prevented from turning during the reciprocation and oscillation of plate 36', and because of the non-rotatable joint between plate 39 and rod lll valve plate il@ is also prevented from turning. The valves at the two ends of the plunger work together and in opposition to the Valve at the intake end of the cylinder. For a long lift pump this modication of the invention is preferable to that first described because the suction chamber is relatively short, being merely the space between the valve plate 33 and the plunger plate 45, which is substantially the length of the stroke of the plunger. The operation of this form of pump otherwise is the same as that of the rst described form.

I-Iaving thus described my invention, I claim:

i. In a pump or the like, a cylinder, a plunger mounted in said cylinder, means for imparting a compound reciprocating and oscillating movement to said plunger, valve means for one end of said cylinder Xed against longitudinal movement, and means actuated by the plunger for imparting movement to said valve around the axis of the cylinder.

2. In a pump or the like, a cylinder, a plunger mounted in said cylinder, means for imparting a compound reciprocating and oscillating movement to said plunger, valve means in one end of said cylinder, said valve means having a cylindrical skirt set into the cylinder ush with the inner surface thereof, means preventing movement of the valve means longitudinally of the cylinder, and interconnecting means between said plunger and skirt permitting relative longitudinal movement and preventing relative rotational movement..

3. In a pump or the like, a cylinder, a plunger mounted in said cylinder, means for imparting a compound reciprocating and oscillating movement to said plunger, valve means carried by the cylinder at one end thereof, said valve means comprising a. cylindrical skirt set into the cylinder flush with the inner surface thereof and held against longitudinal movement, and a pin and groove connection between said skirt and plunger, the groove running parallel to the axis of the cylinder, whereby the oscillating motion only of the plunger is communicated to said valve means.

4. In a pump or the like, a cylinder, a plunger mounted in said cylinder, means for imparting a compound reciprocating and oscillating movement to said plunger, a disk valve at one end of said plunger held against relative movement axially of the plunger, and tongue and groove means between the valve and cylinder for preventing oscillating motion of the valve disk.

5. In a pump or the like, a cylinder, a hollow plunger mounted in said cylinder, means for imparting a compound reciprocating and oscillating motion to said plunger, a disk valve at each end of said plunger, means connecting said valves together and preventing relative rotation thereof, and means at one end of the plunger for preventing oscillating motion of said valves relative to said cylinder.

6. In a pump or the like, a cylinder, a hollow plunger mounted in said cylinder, means for imparting compound reciprocating and oscillating motion to said plunger, a disk valve at each end of said plunger, an axial bar rigidly connecting said valves together so as to prevent relative rotation and relative axial movement, said cylinder having a longitudinal groove therein and one of said valves having a tongue running in said groove, whereby both of said disk valves are'held against oscillating motion.

'7. In a pump or the like, a cylinder, a plunger mounted therein having a flow passage therethrough, means for imparting a compound reciprocating and oscillating motion to said plunger, a disk valve carried by the cylinder, a disk valve carried by the plunger, means actuated by the plunger to impart an oscillating motion to said cylinder valve, and means associated with the cylinder for holding said plunger valve against oscillation.

8. In a pump or the like, a cylinder, a plunger mounted therein having a ow passage therethrough, means for imparting a compound reciprocating and oscillating motion to said plunger, a disk valve carried by the cylinder, a disk valve carried by the plunger, a tongue and groove connection between the plunger and said cylinder valve for oscillating the latter and a tongue and groove connection between the cylinder and said plunger valve for holding the latter against oscillation.

HOWARD L. BANCROFT. 

